Re: [Xen-devel] [PATCH 09/17] x86/amd: put setting pv_post_outb_hook under CONFIG_PV

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, Oct 25, 2018 at 03:22:17AM -0600, Jan Beulich wrote:
> >>> On 15.10.18 at 13:19, <roger.pau@xxxxxxxxxx> wrote:
> > On Fri, Oct 12, 2018 at 08:14:36AM -0600, Jan Beulich wrote:
> >> >>> On 04.10.18 at 17:43, <wei.liu2@xxxxxxxxxx> wrote:
> >> > It is used by PV code only.
> >> 
> >> And wrongly so - the same is needed for a PVH Dom0 afaict.
> > 
> > Yes, looking at the models affected by this issue according to
> > init_amd it seems to cover the full AMD line (from family 0xf to
> > 0x17). I don't seem to find a reference in the code to the Errata, do
> > you know if there's some formal description of it?
> 
> I don't recall this having been considered an erratum.
> 
> Checking just the Fam10 and Fam15 BKDGs, I'm getting the
> impression that Fam15 does not have the issue worked around
> here. It might further be that not even all Fam10 steppings are
> affected. Brian - any chance you could clarify this for us?
> 
> Independent of the range of systems affected I still think that
> PVH Dom0 behavior here ought to be the same as PV Dom0's.

Posted a series before going on PTO that contains a patch to add this
behavior to PVH Dom0:

https://lists.xenproject.org/archives/html/xen-devel/2018-10/msg01558.html

Regardless of the clarification on the affected models the patch
shares the detection logic between PV and PVH, so it can be easily
modified afterwards to narrow the scope of the workaround if required.

Thanks, Roger.

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